Road Milling Ejector Assembly for Fast Wear Reversal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing ejector units in road milling machines are prone to severe wear and tear, requiring frequent replacement and alignment, which is tedious and time-consuming, leading to increased machine downtimes and maintenance workloads.
Innovation Solution
An ejector unit that can be attached to a carrier in at least two different operating positions, allowing for rotation by 180° when wear is reached, extending the service life and enabling quick and easy replacement, with a mechanical interface for secure fastening and optimized geometry for load distribution and wear protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ejector is welded to the milling tube, then the ejector is securely fixed, but the replacement and alignment work is tedious and time-consuming
Solution Approach 1:
The ejector system is divided into separate components: the ejector element can be removed and replaced independently from the carrier, eliminating the need to replace the entire welded assembly. This segmentation allows for quick replacement of only the worn ejector while retaining the carrier structure.
Solution Approach 2:
The ejector is designed with a dynamic replacement mechanism that allows it to be quickly attached and detached from the carrier using simple fastening elements, transitioning from a static welded connection to a dynamic, easily replaceable connection that reduces maintenance time.
2Reliability
If the ejector is replaced frequently due to wear, then fresh ejectors maintain performance, but machine downtime increases
Solution Approach 1:
The carrier is prepared in advance with mounting structures and fastening elements that enable rapid installation of replacement ejectors. The modular design allows operators to quickly swap ejectors without extensive preparation or alignment work, minimizing machine downtime.
Solution Approach 2:
The ejector replacement system is designed to be easily serviceable by operators without requiring specialized welding equipment or extensive training. The simple fastening and replacement mechanism enables maintenance personnel to quickly replace worn ejectors themselves, reducing dependency on specialized services and minimizing downtime.
3Manufacturing precision
If the ejector is precisely aligned during installation, then ideal ejection performance is achieved, but the alignment process becomes more complex
Solution Approach 1:
The ejector and carrier are designed with self-aligning features through their mechanical interfaces and fastening structures. The mounting geometry automatically guides the ejector into the correct position during installation, eliminating the need for complex alignment procedures while ensuring precise positioning and ideal ejection performance.
4Duration of action of stationary object
If the ejector works until wear limit, then service life is maximized, but ejection performance degrades
Solution Approach 1:
The ejector system separates the wear-prone ejector element from the durable carrier structure. This allows the ejector to be replaced independently when it reaches wear limits, while the carrier continues to provide structural support and positioning, maximizing overall system service life without compromising ejection performance.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
The invention relates to an ejecter unit, in particular for a road milling machine, comprising an ejecter which is replaceably attached to a carrier.