Detachable Double-Locking Rivet for Metal-Composite Joints
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Solution Overview
Problem
Existing methods for connecting metal plates to non-metal plates, such as in railway box car construction, face issues with low connection strength and difficulty in dismounting due to the use of screws or general rivets, which can lead to loosening and crushing of composite plates under load.
Innovation Solution
A detachable double-locking riveting method using a pulling rivet with a lantern ring and a rivet that includes a bending hook section and a locking section, allowing for radial and axial locking, and a dismounting tool for easy detachment, ensuring secure connection and easy disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If general rivets are used to connect metal plates to non-metal plates, then connection strength is improved, but the non-metal composite plates are crushed under strong riveting force and dismounting becomes difficult
Solution Approach 1:
The lantern ring is divided into two functional sections: a thin-wall bending hook section for axial locking and a thick-wall locking section for radial locking. This segmentation allows the riveting system to achieve strong connection without concentrating excessive force on a single structure, thereby preventing crushing of composite plates while maintaining both installation and dismounting capabilities.
2Ease of operation
If screws are used for connection, then dismountability is improved, but connection strength is low and screws are easy to loosen under collision
Solution Approach 1:
The lantern ring employs dynamic locking mechanisms that adapt to operational conditions. The bending hook section provides axial locking that can accommodate thermal expansion and vibration, while the thick-wall locking section provides radial locking. This dynamic design maintains strong connection under collision while allowing for controlled dismounting when needed.
3Strength
If riveting is used to connect metal plates to non-metal plates, then connection strength is improved, but dismounting becomes very difficult
Solution Approach 1:
The thin-wall bending hook section is designed to be extracted or removed from the thick-wall locking section during dismounting. This extraction mechanism allows the lantern ring to be taken apart after riveting, enabling easy dismounting of the connection while maintaining strong riveting strength during service. The separable design resolves the contradiction between strong connection and easy dismounting.
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 solution provides a safe, reliable, and cost-effective method for riveting and dismounting metal plates, preventing loosening and crushing, with quick installation and maintenance, suitable for various materials and applications, including steel, aluminum, and composite plates.
Implementation Method 1
achieving interference fit between the locking section of the lantern ring and the knurling section of the rivet so as to from radial locking
Implementation Method 2
deforming the bending hook section of the lantern ring into a hook shape to buckle the lower connected plate, thus forming axial locking
Implementation Method 3
continuing pulling the rivet backward, separating the rivet at the separating groove
Data Source
AI summary
The invention discloses a detachable double-locking riveting dismounting method and a pulling rivet. A lantern ring comprises a thin-wall hook section, a thick-wall locking section and a lantern ring head with an annular step from front to back. The rivet comprises a rivet head of an annular groove matched with the hook section, a front polish rod section, a knurling section matched with the locking section, a separating groove, a rear polish rod and a tail annular groove section from front to back. Double riveting is used by inserting the rivet and lantern ring from both sides; after riveting, the locking section and knurling section form radial locking, and the hook section is buckled to form axial locking. Simple detaching tools (e.g. front snap ring and center cylinder) are equipped to dismount rivets rapidly.