Rotatable Stem Wear Element Fixing System
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Solution Overview
Problem
Existing systems for fixing wear elements in earth-moving machines do not effectively secure the tooth-tooth-holder system, leading to unwanted movement and increased wear, which can result in premature failure of the pin system.
Innovation Solution
A fixing system that includes a rotatable stem with locking elements at both ends, allowing for stable and reliable fixation of wear elements by locking them at separate positions, thereby preventing unwanted movement between the tooth and tooth-holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If wear elements are mechanically fixed, then they are easier and faster to change, but they do not tighten the tooth-tooth-holder system, leading to unwanted movement and increased wear
Solution Approach 1:
The pin system incorporates a rotatable stem that transitions between a release position (for easy installation/removal) and a locking position (for secure fixation). This dynamic mechanism allows the system to switch between ease of repair and reliability based on operational phase
Solution Approach 2:
The fixing system is divided into separate functional components: a stem with locking elements at different positions, a pin, and associated locking mechanisms. This segmentation allows independent optimization of installation ease and fixation reliability
2Ease of manufacture
If wear elements are welded, then they are cheaper to fix, but they are difficult to change and risk damaging the blade
Solution Approach 1:
The system separates the wear element from the blade through an intermediate tooth-holder component, allowing the wear element to be replaced without welding or damaging the blade. The pin system provides a mechanical connection that is both economical and reversible
Solution Approach 2:
The pin system extracts the wear element from direct welding to the blade, using a removable mechanical fastening system instead. This allows cost-effective fixation while maintaining ease of repair through simple pin removal
3Device complexity
If the tooth is not tightened on the tooth-holder, then assembly is simpler, but there is relative movement between contact planes that facilitates fines entry and increases internal wear
Solution Approach 1:
The stem rotates from a release position during assembly to a locking position that tightens the tooth on the tooth-holder. This dynamic transition maintains assembly simplicity while ensuring operational tightness to prevent wear and fines entry
Solution Approach 2:
The locking elements are pre-positioned on the stem to automatically engage when the stem is rotated to the locking position. This preliminary arrangement ensures tight contact between tooth and tooth-holder without complex assembly procedures
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 system effectively secures the tooth on the tooth-holder, preventing unwanted movement and reducing internal wear, thereby extending the lifespan of the wear elements and the pin system.
Implementation Method 1
a first locking element (2), made of an elastic material, positioned at an inner end of said stem
Data Source
AI summary
A system for fixing wear elements in earth-moving machines is provided which comprises a stem that rotates between a locking position and a release position, with locking elements including a first deformable locking element placed at the inner end of the stem and a second locking element arranged towards the outer end of the stem. This system allows for providing a an easy to manipulate and improved manner of securing the contacts between the tooth and the tooth-holder of an earth-moving machine.