Piston Sealing Band Angular Locking Mechanism
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Solution Overview
Problem
In cold chamber die-casting machines, the sealing band tends to rotate and settle in unsuitable positions due to its split or interruption design, leading to inefficiencies in sealing and wear, particularly at areas with high fluidity and mechanical interference points.
Innovation Solution
A piston design with axial and angular locking means, utilizing radial projections and slots on the sealing band to secure it in place, allowing for symmetrical arrangement and distribution of locking points along the band's circumference, facilitating assembly and preventing rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sealing band has a split or interruption to allow assembly and radial expansion, then the band can be assembled and expanded, but the band tends to rotate and settle in unsuitable positions
Solution Approach 1:
The patent applies preliminary action by providing guiding surfaces on the piston head that pre-position the sealing band in the correct angular orientation during assembly. The guiding surfaces engage with corresponding features on the sealing band before the split allows final seating, ensuring the band starts in the proper position and cannot rotate to unsuitable positions during operation.
2Adaptability or versatility
If the sealing band is elastic to allow radial expansion, then the band can adapt to container deformations, but the elasticity causes settling in unsuitable positions during assembly
Solution Approach 1:
The guiding surfaces perform preliminary positioning of the elastic sealing band during assembly, constraining its initial position before the elastic material is fully engaged. This prevents the elastic band from settling in unsuitable positions while maintaining its ability to expand radially and adapt to container deformations during operation.
Solution Approach 2:
The guiding surfaces act as an intermediary element between the sealing band and the piston head, mediating the positioning process. They provide a controlled interface that guides the elastic band into the correct position during assembly while allowing the band to maintain its elastic properties for radial expansion and adaptation to container deformations.
3Reliability
If separate means are used for axial and angular locking of the band, then the band can be securely locked, but the assembly becomes more complex and difficult
Solution Approach 1:
The patent merges axial and angular locking functions into a single integrated guiding surface structure on the piston head. The guiding surfaces simultaneously provide axial positioning (preventing movement along the piston axis) and angular orientation (preventing rotation), eliminating the need for separate locking mechanisms and simplifying the overall assembly structure.
Solution Approach 2:
The guiding surfaces perform multiple functions simultaneously: they guide the sealing band during assembly, provide axial locking to prevent movement, and provide angular locking to prevent rotation. This multi-functionality reduces the number of separate components needed while maintaining reliable locking in both axial and angular directions.
Data Source
AI summary
The object of the present invention is a piston for cold chamber die-casting machines comprising a body and at least one sealing band mounted around said body, wherein said body and said band are provided with coupling means suitable for concurrently obtaining both an angular locking and an axial locking of the band to the piston body.