Road Miller Ejector Assembly for Fast Replacement and Wear Control
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Solution Overview
Problem
Ejectors in road milling machines undergo severe wear and tear, requiring frequent replacement, which is laborious and challenging due to the need for precise positioning and alignment in confined spaces, necessitating an improvement for easier maintenance.
Innovation Solution
The ejector design features a fastening side with a support surface for secure attachment to a milling tube component, incorporating a troughed conveying surface for improved discharge and wear protection, along with screw receptacles and molded stiffening ribs for enhanced rigidity and easy replacement, allowing multiple operating positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the ejector is welded directly to the milling tube for secure attachment, then the attachment strength is improved, but the replacement complexity increases due to laborious cutting and welding operations in confined spaces
Solution Approach 1:
The ejector system is divided into separate components: the ejector body and the support part. The support part remains welded to the milling tube while the ejector body can be independently removed and replaced. This segmentation allows the ejector to be replaced without cutting or rewelding, significantly reducing maintenance complexity while maintaining secure attachment through the support part's mounting structure.
Solution Approach 2:
The support part acts as an intermediary component between the milling tube and the ejector body. It provides a stable mounting base with mounting surfaces that secure the ejector without requiring direct welding between the ejector and milling tube. This intermediary structure enables easy replacement of the ejector while maintaining strong attachment to the milling tube.
2Ease of manufacture
If the ejector is designed with a simple flat conveying surface, then the manufacturing complexity is reduced, but the discharge efficiency decreases due to poor material accumulation and conveyance
Solution Approach 1:
The conveying surface is designed with a concave curvature instead of a flat surface. This curved geometry creates a scoop-like structure that naturally accumulates material in the depression and directs it toward the discharge opening. The curved surface improves material flow and discharge efficiency without significantly increasing manufacturing complexity, as it can be formed through standard molding or machining processes.
3Weight of moving object
If the ejector is made with minimal material to reduce weight, then the weight is reduced, but the structural rigidity decreases leading to insufficient support against transverse forces
Solution Approach 1:
The support part is designed to extend in the axial direction of the milling tube, providing additional dimensional support. This axial extension creates a larger mounting surface area and provides better leverage for resisting transverse forces. The ejector body is secured to this extended support structure, distributing loads across multiple dimensions and maintaining rigidity without requiring excessive material in the ejector itself.
4Ease of manufacture
If the screw receptacle is designed without a head receptacle, then the manufacturing complexity is reduced, but the screw loosening risk increases due to abrasive wear on the countersunk head area
Solution Approach 1:
The design converts the potentially harmful effect of abrasive wear into a beneficial feature by creating a recessed head receptacle. Instead of allowing screws to protrude and be exposed to abrasive material, the recessed design protects the screw heads from direct contact with abrasive particles. The wear that occurs is directed away from the critical screw engagement area, preventing screw loosening while adding minimal manufacturing complexity.
Data Source
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AI summary
The invention relates to an ejector, in particular for a road milling machine, which significantly simplifies maintenance.