Pallet Container Tube Connection for Vibration Resistance
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Solution Overview
Problem
Conventional pallet containers with trellis tube support casings experience fatigue and fractures due to dynamic vibration stress and transport stress, particularly at the welds and tube connections, during transportation of liquids, leading to potential material damage and failure in certification tests.
Innovation Solution
The implementation of a positive clinched joint on the inside of the horizontal tubes, forming a meshing, undulating connection without external deformation, increases the material's rigidity and resistance to dynamic stress by distributing tension forces more evenly and reducing material stress at the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional welds and tube connections are used in the trellis frame, then the structure can be assembled, but fatigue fractures and tube fractures occur under dynamic vibration stress and transport stress
Solution Approach 1:
The invention extracts the problematic welded joints and replaces them with a welding-free tube connection system. The tubes are connected through insertion and mechanical fastening elements that eliminate welds, which are identified as stress concentration points prone to fatigue fractures under dynamic vibration stress.
Solution Approach 2:
The invention changes the connection parameter from welded joints to mechanical fastening with insertion depth of 50mm and fastening elements positioned at specific locations. This parameter change transforms the connection method to one that distributes stress more evenly and avoids the stress concentration inherent in welded joints.
2Ease of manufacture
If the trellis frame is designed with welded tube connections, then assembly is achieved, but additional fastening means are required to prevent fractures under stress
Solution Approach 1:
The invention merges the tube connection function with integrated fastening elements that are part of the tube structure itself. The fastening elements are formed as integral parts of the tubes during manufacturing, eliminating the need for separate additional fastening components while maintaining connection strength.
Solution Approach 2:
The tubes are designed with self-fastening capabilities through inserted fastening elements that secure the connection without requiring external additional fastening means. The connection system is self-sufficient, with the fastening elements being inherent to the tube design rather than separate components.
3Stability of the object's composition
If horizontal tubes are connected with conventional methods, then the outer container is closed, but deformation and stress concentration occur at the connection locations
Solution Approach 1:
The invention incorporates pre-formed fastening elements within the tubes before assembly. These fastening elements are prepared in advance during tube manufacturing, positioned at specific locations, and designed to prevent deformation at connection points before the actual joining occurs under stress.
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
This solution enhances the stability and resistance of the trellis frame against alternating bending stresses and long-term dynamic vibration-induced stress without the need for additional fastening components, reducing the risk of cracking and material failure.
Implementation Method 1
a positive clinched joint arranged on the inside of the horizontal tubes, wherein the outside of the horizontal tubes is free from any kind of deformation
Data Source
AI summary
The present invention relates to a pallet container (10), with a thin-walled, rigid inner container (12) composed of thermoplastic material for the storage and transport of liquid or pourable contents, with a trellis tube support casing (14) tightly enclosing the plastic container (12), and with a base pallet (16), on which the plastic container (12) rests and to which the support casing (14) is rigidly connected, wherein the trellis tube support casing (14) is constructed of vertical and horizontal tubes (18, 20) that are welded to each other, with the peripheral horizontal tubes (18) being rigidly connected to each other. The connection of the horizontal tubes (18) is accomplished by a positive clinched joint (24) disposed on the inside of the horizontal tubes (18), wherein the outside of the horizontal tubes (18) is free from any clinched joint deformations.