Pipe Joint Watertightness Testing with Foldable Rod Support
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Solution Overview
Problem
The existing watertightness testing device is susceptible to downward deflection of the moving operation rod due to its weight, and the attaching portion is prone to damage, requiring external support that can hinder pipe-joining operations.
Innovation Solution
The device incorporates a main supporting member with a rotatable main rolling member that can switch between a supporting posture outside the pipes and a folded posture inside the pipes, preventing deflection and damage to the moving operation rod.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the moving operation rod is made long to operate the testing device body inside the pipes, then the operating reach is improved, but the rod becomes susceptible to downward deflection due to its own weight
Solution Approach 1:
A support table is introduced as an intermediary structure to support the moving operation rod at multiple positions along its length. The support table acts as a mediator between the rod and the external environment, providing intermediate support points that prevent the rod from deflecting under its own weight while allowing the rod to maintain its required length for operating the testing device body inside the pipes
2Stability of the object's composition
If the moving operation rod is supported by a support table during pipe joining, then the rod stability is improved, but the support table becomes a hindrance to pipe-joining work
Solution Approach 1:
The support table is designed with movable and adjustable characteristics, allowing it to be dynamically repositioned or reconfigured during the pipe-joining process. The support table can be moved along the pipes or adjusted in height and position to accommodate the specific requirements of pipe-joining operations, thereby maintaining rod stability while eliminating interference with joining work
3Adaptability or versatility
If the moving operation rod is made long to reach from outside the pipes to the testing device body, then the operational flexibility is improved, but the attaching portion becomes susceptible to damage due to stress
Solution Approach 1:
The moving operation rod is divided into multiple segments or sections, with intermediate support points provided by the support table. This segmentation reduces the span between support points, thereby reducing the bending moment and stress concentrated at the attaching portion. The rod can still maintain its overall length for operational flexibility, but the segmented structure with intermediate support prevents excessive stress at critical attachment points
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 allows for the prevention of moving operation rod deflection and damage, facilitating smoother pipe-joining operations without external support hindrances, and enabling efficient watertightness testing.
Implementation Method 1
the main supporting member has a rotatable main rolling member in a lower end section
Implementation Method 2
a spring, which urges the main supporting member from the folded posture toward the supporting posture, is provided on the moving operation rod
Data Source
AI summary
A watertightness testing device (1) for performing a watertightness test of a joined section between joined pipes (2 and 3), the watertightness testing device (1) including a testing device body (21) and a moving operation rod (22) for moving the testing device body (21) in the pipes in a pipe axial direction (B) from outside an end section of the pipes, wherein the moving operation rod (22) is provided in the testing device body (21) and extends along the pipe axial direction (B), main supporting members (61 and 62) for supporting the moving operation rod (22) are provided on the moving operation rod (22) outside the pipe (2), and the main supporting members (61 and 62) have a rotatable main rolling member (75) in a lower end section, the main supporting members (61 and 62) are switchable between a supporting posture (K) in which the main supporting members (61 and 62) support the moving operation rod (22) outside of the pipes and a folded posture in which the main supporting members (61 and 62) are folded inside the pipes, and the main supporting members (61 and 62) are urged from the folded posture toward the supporting posture (K).