Pin Puller with Alignment Groove Prevents Tilting
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Solution Overview
Problem
Multi-part pin pullers often cause damage to components and wear out due to tilting of the pull rod relative to the pin's axial direction, leading to a less firm frictional connection and potential pin release, as well as thread wear from non-axial alignment.
Innovation Solution
A multi-part pin puller with a holder featuring a hook-shaped extension for alignment, ensuring the pull rod moves concentrically with the pin's axis, and a threaded section for secure engagement, preventing tilting and wear by maintaining a proper form fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pull rod is connected to the pin without alignment means, then the pin can be removed, but the pull rod tilts relative to the pin's axial direction causing component damage and thread wear
Solution Approach 1:
The holder is designed with a groove that receives the pin before the pulling operation begins. This preliminary positioning ensures that the pull rod remains axially aligned with the pin throughout the removal process, preventing tilting and subsequent component damage or thread wear.
2Productivity
If the pull rod is moved along the axial direction without alignment constraints, then the pin can be pulled out, but the holder or pull rod tilts causing expansions in the hole opening area
Solution Approach 1:
The groove in the holder positions the pin axially before the pulling operation, ensuring the pull rod moves concentrically to the pin's axis. This preliminary alignment prevents tilting and subsequent hole opening expansions during the extraction process.
3Strength
If the threaded cuts of the pin and pull rod are engaged without alignment, then the pin can be secured to the pull rod, but the threaded cuts wear out due to non-axial parallel arrangement
Solution Approach 1:
The holder's groove receives the pin before threading engagement, establishing proper axial alignment. This preliminary positioning ensures that when the threaded cuts are engaged, they remain axially parallel, preventing wear and maintaining the strength of the form fit connection.
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 design reliably prevents component damage and wear, ensuring secure pin removal and reinsertion with consistent frictional connection, maintaining the integrity of both the pull rod and component threads.
Implementation Method 1
The pull rod (12) is provided with a thread (18) and a holder (16) which accommodates the pull rod (12) and which can be supported on the latter (12) in order to release the pin (32) from the component (30)
Implementation Method 2
The holder (16) has a hook-shaped extension (24) as a means for aligning the pin puller (10) with respect to the component (30)
Implementation Method 3
The pins are usually firmly seated in the component and are generally held in place by friction
Data Source
Figure 1
Figure 2
AI summary
The extractor (10) has a pull rod (12) provided with a thread, and a holder (16) accommodating the rod. The rod is supportable at the holder for detaching a pin (32) from a component (30) i.e. rotor disk of gas turbine. The pull rod is connected with the pin to be detached in a form-fit manner, and is movable in a pulling direction in a condition connected with the pin by rotation of a screw nut (20). The screw nut is supported at the holder. The holder includes an aligning unit for aligning the extractor opposite to the component.