Reversible Ejector for Road Milling Machine Wear Reduction
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Solution Overview
Problem
The existing ejector units in road milling machines are subject to severe abrasive wear, requiring frequent replacement and laborious maintenance, with existing solutions failing to simplify the process and extend service life effectively.
Innovation Solution
The ejector unit is designed for easy replacement with a mountable ejector that can be rotated 180 degrees when worn, featuring a mechanical interface for secure mounting and a wear-resistant conveying surface, extending service life and simplifying maintenance by allowing operation in multiple positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ejector is welded onto the milling tube, then secure mounting is achieved, but replacement becomes laborious and time-consuming
Solution Approach 1:
The ejector system is divided into two separate components: the ejector itself and the carrier part mounted on the milling tube. This segmentation allows the ejector to be easily detached and replaced without welding, while the carrier part remains securely mounted on the milling tube. The mounting elements provide sufficient connection strength for secure mounting during operation.
2Reliability
If the ejector is replaced frequently due to wear, then discharge performance is maintained, but machine downtime increases
Solution Approach 1:
The ejector is designed with rotational symmetry that allows it to be rotated 180 degrees and reused. This dynamic reuse approach extends the service life of the ejector by utilizing both sides of the conveying surface, thereby reducing the frequency of replacements and minimizing machine downtime while maintaining discharge performance.
3Duration of action of stationary object
If the ejector service life is extended through rotation, then replacement frequency is reduced, but positioning precision must be maintained
Solution Approach 1:
The ejector is designed with asymmetric wear patterns where one side of the conveying surface wears faster than the other. The rotational symmetry of the ejector body allows it to be rotated 180 degrees to present the less worn side to the milling tube, effectively extending service life while maintaining precise positioning through the standardized mounting interface.
Data Source
AI summary
The invention relates to an ejector unit, in particular for a road milling machine, having an ejector that is replaceably mounted on a carrier. In one aspect the ejector is curved in a scoop-like fashion. In another aspect the ejector is reversible upon the carrier to allow the ejector to be reversed after one wear surface is worn, thus presenting a new second wear surface.