Excavator Cutting Head Dual-Blade Design for Deformation Control
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Solution Overview
Problem
Cutting grabs on excavators and forestry machines face blade deformation due to large forces, leading to reduced performance and potential damage from continued use.
Innovation Solution
A cutting head design featuring two symmetrically shaped blades with wedge-cutting edges in the same plane, equipped with semi-circular grooves on both sides, which distribute cutting forces and prevent bending, made from wear-resistant materials like Hardox Extreme steel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single blade is used in cutting grabs, then the device complexity is reduced, but the blade is subjected to large forces causing deformation and damage
Solution Approach 1:
The cutting head is divided into multiple blades (at least two) instead of using a single blade. Each blade independently handles a portion of the cutting force, thereby distributing the mechanical load and reducing deformation risk on individual blades while maintaining cutting effectiveness.
2Strength
If blades are made from wear-resistant materials, then the blade strength and durability are improved, but the manufacturing cost and difficulty increase
Solution Approach 1:
The blade material properties are modified by changing parameters such as hardness and wear resistance through material selection (e.g., Hardox Extreme steel). This involves selecting materials with optimized mechanical properties to withstand cutting forces while maintaining manufacturability through standard fabrication processes.
3Reliability
If grooves are added to the blade edges, then the distribution of cutting forces is improved and wood slippage is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
Grooves are added locally to specific regions of the blade edges where cutting forces are concentrated. These grooves create localized features that improve force distribution and prevent wood slippage during cutting, while the rest of the blade maintains its structural integrity and can be manufactured using standard processes.
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 dual-blade design effectively reduces the likelihood of blade deformation and maintains efficient cutting performance by distributing forces and preventing wood slippage, while allowing for easy sharpening and optimal blade positioning.
Implementation Method 1
wherein the cutting edges of the blades are wedge-shaped and located in the same plane, so that upon cutting a tree/bush or a plurality of trees/bushes can be cut in one plane
Implementation Method 2
Both blades are symmetrically shaped and have on their edges grooves of any geometrical shape, preferably semi-circular shape... the grooves match so that the grooves on the bottom side are located between the grooves on the upper side
Data Source
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AI summary
The present invention belongs to the field of forestry and working machines for deforestation or reduction of trees and bushes on lake and river shores, more precisely to the field of blades and cutting heads to be installed on an excavator or a forestry machine. The essence of the cutting head is in that it comprises two blades, mounted into lower part of a gripping-cutting branches, wherein the cutting edge of the blades are wedge-shaped and located in the same plane, so that upon cutting the tree can be cut in one plane. Both blades are symmetrically shaped and have on their edges grooves of any geometrical shape, preferably semi-circular shape, the number of the grooves being arbitrary. The preferred embodiment has semi-circular grooves on both sides of the blades, wherein the grooves match so that the grooves on the bottom side are located between the grooves on the upper side.